If you’ve ever walked the aisles of a grocery store, visited a farmers’ market, or run a small retail shop, chances are you’ve already seen biodegradable plastic bags in action. As a biodegradable plastic bag supplier, I get dozens of questions a day from store owners, event planners, and even regular customers asking if these bags are “set it and forget it” — or if they have a hidden catch. The most common question? Do biodegradable plastic bags require special storage conditions to stay effective? Biodegradable Plastic Bag
It makes sense that this confusion exists. We’re used to conventional plastic bags, which can sit in a warehouse for years, get dragged in and out of delivery trucks, and left in a hot car, and still work exactly like they did the day they rolled off the assembly line. Biodegradable bags, though, are designed to break down — and that means their shelf life and performance depend on more than just how they’re made. Over the 12 years I’ve been supplying these bags, I’ve seen too many customers run into avoidable issues because they stored them the wrong way. I’ve also figured out which conditions make a big difference, and which are totally non-negotiable. Let me break this down clearly, so you don’t end up with a stack of bags that fall apart before you even use them.
First, let’s get one basic point straight: all biodegradable plastics aren’t the same. The bags we supply are what’s called “compostable” under ASTM D6400 and EN 13432 standards — meaning they break down safely in industrial compost facilities in 180 days or less, leaving no toxic residue. There are also bags marketed as “oxo-biodegradable,” which use additives to break down into microplastics in open landfills. Those are a whole different story, and they don’t need the same storage rules as the compostable ones we carry. That’s a key distinction because the storage questions only apply to the compostable kind, the only truly biodegradable option that actually lives up to its environmental promise.
Now, the core issue: why does storage matter at all? Compostable plastic bags are made from a mix of polymers — usually plant-based starches (like corn or sugarcane), biopolymers such as PLA (polylactic acid), and a small amount of conventional plastic to give them strength. The starch component is the one that makes them biodegradable, and it’s also the part that’s sensitive to extreme moisture, heat, and UV light. Let’s walk through each of these factors one by one, because each one affects the bag’s lifespan and usability.
Moisture is probably the biggest culprit I see. If a bag is exposed to high humidity — like being stored in a damp warehouse basement, a garage where it rains through a leaky window, or even a truck that gets loaded in a humid coastal port — the starch in the bag absorbs water. That sounds harmless enough, but when starch absorbs moisture, it starts to break down internally long before it comes into contact with compost or soil. A bag that’s been sitting in a 70% humidity space for six months might feel a little stiff, or it might start to get sticky along the seams. Leave it longer, and when you go to pick up a heavy load of groceries, the seam will split, or the bag will tear in your hand.
I learned this lesson early on. A restaurant client of mine in Miami stored 10,000 biodegradable bags in their outdoor storage shed during rainy season. Within three months, half of the bags were useless — they crumpled into a mushy mess when lifted. We had to rush a replacement order, and the client lost almost $800 in wasted product. Now, we always warn our customers about humidity: keep bags in a dry space, with a relative humidity under 50% if possible. If you have to store them in a non-climate-controlled space, a heavy-duty plastic bin with a tight lid works perfectly to block moisture. We even include a small silica gel packet in every bulk order now, just as a free extra precaution.
Next up, heat. Biodegradable plastics aren’t like conventional plastic, which can handle high heat without breaking down. Most of the polymer mix in our bags starts to degrade when temperatures stay consistently above 110°F (43°C). That might sound obvious, but think about how many people leave pallets of bags in delivery trucks all day in summer, or stack them in a warehouse where heat builds up near a loading dock or a boiler. I’ve had a customer in Phoenix call me in July saying their bags were falling apart before they even reached the store. When we went over their storage setup, they were keeping the pallets right next to the building’s HVAC system outlet, which blows 115°F air all day.
High heat doesn’t just make the bag weak — it also shortens its overall shelf life. A bag that’s stored in 100°F heat will start to lose its tensile strength in as little as two months, whereas the same bag stored in a cool, 65°F room will stay strong for 12 to 18 months. For small business owners, that means if you order a bulk shipment in winter, you’ll get way more usable bags than if you order the same amount in July. We always advise customers in hot climates to order smaller, more frequent shipments instead of one big pallet, so they don’t have to store bags through extreme heat.
UV light is the third big factor, and it’s the one people rarely think about. Biodegradable bags break down when exposed to natural sunlight, same as many other organic materials. If you store your bags outside, or in a warehouse with large unshaded windows where direct sun hits the pallets all day, the UV rays will eat away at the bag’s molecular structure. The first sign is usually a chalky, white powdery residue on the surface, and then the bag will become brittle, tearing at the slightest touch.
One of my regular clients is a beachfront café in Southern California. They used to stack their bag pallets right outside their back door, since they had limited indoor storage. Within four weeks, half their stock was too brittle to use for carrying surfboards or bulk produce. We worked with them to install a simple, weatherproof awning over the outdoor storage area, and that fixed the problem entirely. If you have to store bags in a space with sunlight, even just indirect light, keep them covered with a opaque tarp or plastic sheet, and try to limit the time they’re exposed. A tip: our bags are printed with UV-stabilized ink, but that only protects the graphics, not the bag itself — so don’t mistake the ink for a shield against sunlight.
Now, here’s the good news: special storage conditions don’t mean you have to turn your storeroom into a climate-controlled lab. All the requirements are simple, low-cost steps that add up to way less hassle than dealing with torn bags or returns. Let’s outline the basic storage rules we share with every customer:
First, keep bags in a dry space — not just “not wet.” That means no basements with leaky pipes, no garages where water can seep in, and definitely no outdoor storage. A cool, dry interior closet or small storeroom is perfect. If you have to use a semi-outdoor space, invest in airtight plastic bins instead of leaving pallets wrapped in thin plastic. It’s cheap, and it makes a huge difference.
Second, keep temperatures consistent. Avoid spaces where temperatures swing wildly — like attics that get 120°F in summer, or near heating ducts in winter. The ideal range is between 50°F and 80°F (10°C to 27°C). For customers in extreme climates, we offer custom storage bags that are a little thicker and have an extra moisture barrier, but even with standard bags, a insulated cover for delivery pallets works well if you’re moving them in and out of hot or cold spaces.
Third, avoid direct sunlight. If your storeroom has windows, keep pallets away from them, or hang a simple curtain or opaque sheet to block the sun. Even indirect sunlight can add up over time. For store owners who display bags at checkout (a great way to show your commitment to sustainability), keep those display stands out of direct overhead lights, which also emit UV rays — that’s why you might have seen grocery store checkout bags fade over time, even when they’re inside.
Wait a second, though — are there any myths I can bust here? Because I’ve heard some customers say biodegradable bags have to be stored in a commercial compost facility, or that they’ll start breaking down if you touch them with your bare hands. That’s 100% not true. The biodegradable process only happens when the bags are exposed to the specific conditions of industrial compost: high heat, high moisture, and the right mix of microbes. Storing them in a dry, cool, dark space doesn’t trigger breakdown — it actually preserves their effectiveness until you’re ready to use them. Another myth: freezing them will make them last longer. I’ve tested this, and freezing doesn’t harm or help them, but it’s totally unnecessary. There’s no benefit to freezing your bags, and it’s a waste of energy and money, especially for small businesses.
I also get asked a lot about what happens if someone doesn’t follow these rules. If a bag is stored wrong, it doesn’t magically turn into compost on your storeroom shelf. It just becomes a bad version of a plastic bag: weak, prone to tearing, and useless for carrying heavy items. That defeats the whole purpose of choosing biodegradable bags, right? If you wanted a flimsy bag that falls apart, you could buy the cheap conventional kind. Our customers choose our bags because they’re strong, durable, and actually break down when they’re done being used — not before.
Now, let’s talk about how this translates for you, whether you’re a small retail owner, a restaurant operator, or someone who buys these bags in bulk for a community event. As a supplier, we don’t just drop ship pallets and disappear — we’re here to help you make the most of your order. That’s why we include a one-page storage guide with every shipment, and why my team is always happy to walk through your space with you to suggest small changes. Last year, we helped a bookstore owner in Seattle reorganize their small back room to keep book bags off the concrete floor (concrete holds moisture!) and away from their space heater, which they’d been running all winter. They saved over 20% of their annual order because of those two simple adjustments.
What if you already have bags that you’re worried are stored wrong? Don’t panic. Pick one up and give it a squeeze. If it still feels thick and strong, it’s probably fine. If it’s thin, chalky, or crumbles when you fold it, it’s time to use those bags first, or even repurpose them for non-critical uses (like lining small trash cans instead of carrying heavy groceries). Just don’t throw them away — even a biodegradable bag is better for the environment than a conventional one, as long as it actually works when you use it.
At the end of the day, the biggest takeaway is this: biodegradable plastic bags do require a little more care than conventional plastic bags, but it’s not complicated, expensive, or time-consuming. The conditions are just basic common sense — keep them dry, cool, and out of sunlight. That’s all it takes to make sure your bags perform as intended, and that you’re actually getting the environmental benefit you’re paying for.
If you have questions about storage, or you’re ready to place an order for your business, feel free to reach out to our team for personalized guidance. We’re happy to help you find the right bag style for your needs, and share more tips to keep them in great shape from our warehouse to your shelves.
Plastic Die Cut Bags & Patch Handle Bag References
ASTM International. (2020). Standard Specification for Compostable Plastics (ASTM D6400-19).
European Committee for Standardization. (2013). Packaging – Requirements for Packaging Recoverable through Composting and Biodegradation – Test Scheme and Evaluation Criteria for the Final Acceptance of Compost (EN 13432:2013).
Plastics Industry Association. (2022). Biodegradable and Compostable Plastics: Shelf Life and Storage Best Practices.
U.S. Environmental Protection Agency. (2021). Composting: A Guide to Successful Home and Industrial Composting.
Xiamen Leadkit Group Co., Ltd.
Xiamen Leadkit Group Co., Ltd. is one of the most professional biodegradable plastic bag manufacturers and suppliers in China, specialized in providing high quality customized service. Please feel free to wholesale cheap biodegradable plastic bag from our factory. Contact us for more details.
Address: No.398, Jiahe Road, Huli District, Xiamen, Fujian, China
E-mail: effie@leadkitpackaging.com
WebSite: https://www.leadkitpackaging.com/
